Making no excuses
But there is a reason P&O and sundry others haven't passed on fuel price reductions. It's all to do with when they bought the fuel. All these types of companies bulk buy their fuel in advance (no pulling up at the pumps in your ferry) and so are constantly gambling on fuel prices. When it looked like they were going up and up they bought in to it thinking they'd be getting cheap fuel in the long term. They lost out, fuel is dropping but they've paid in advance, so they pass this on to us.
That's the basic economics of it, of course they'll pop fuel surcharges on in a flash and drag their heels as long as possible when it comes to dropping them.
Happiness has 125 cc